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BOOK: Beginning JavaScript 5th Edition
This is the forum to discuss the Wrox book Beginning JavaScript, 5th Edition by Jeremy McPeak; 978-1-118-90333-9
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Old April 21st, 2016, 11:58 AM
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Default Chapter 2 - post increment /decrement not working

Hi, I've just started learning javascript with this promising book, but I got stuck in the increment and decrement part. The post increment /decrement not working with me:
HTML Code:
<script> 
var myFirstVariable=1;
var result; 
result=myFirstVariable++;
alert(result);
</script>
It shows the value without any change, that is 1
What am I missing here?
Thanks in advance
 
Old May 23rd, 2016, 10:04 AM
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Smile

He assign the value to the variable "result" first.
Then he increment the variable "myFirstVariable".

If you want to verify, if the variable was incremented just write another alert function under the first one.

<script>
var myFirstVariable=1;
var result;
result=myFirstVariable++;
alert(result);
alert(myFirstVariable);
</script>

If you use the prefix increment:
result=++myFirstVariable;

It will increment first, and then assign the value to the variable.




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